Gauging tool



Patented Dec. 21, 1943l UNITED STATES PATENT OFFICE GAUGING TOOL StevenKoller, Detroit, Mich.

Application July 21, 1941, Serial No. 403,323

Z Claims.

This invention-relates to a gauging tool.

It is an object of the present invention to provide a machinist's squarewhich will permit accurate testing of work being machined.

It is a further object of the invention to provide a checking tool whichmay be readily fastened to work to leave the operators hands free forthe checking operations. l

A further object of the invention is lthe provision of a suitablesupporting means for the tool which insures proper contact with the workat all times, and the design of checking surfaces to avoid inaccuratereading.

Other objects and features of the invention having to do with details ofconstruction will be brought out in the following description andclaims.

In the drawing:

Fig. 1 is a view illustrating the use of the tool for checkingsquareness.

Fig. 2 is an end View taken on line 2--2 of Fig. 1.

Fig. 3 is a sectional view on line 3-3 of Fig. 2, showing the relationof the parts.

Fig. 4 is a further sectional view taken on the line 4-4 of Fig. 3.

Fig. 5 is a, section on the line 5--5 of Fig. 1.

Referring to the drawing, a work piece is shown at I in Fig. 1, restingon a table Il. The tool which consists of an L-shaped square comprises ashort leg I2 and a long leg I3, and a holding means I4. A gauge Islidable on the table II is used forchecking the condition of the Work,see Fig. 5. A small pin I5a is provided to contact the leg I3 of thesquare.

Taking up in detail the holding means I4, the short` leg I2 of thesquare is floatingly mounted between two plates 20. These plates arepreferably formed of soft iron having a high permeability. At rightangles to each of these plates is a semi-circular plate 2| on which issupported a circular housing 22 formed of non-magnetic material. Betweenplates 20 is a U-shaped bar 23 formed of a non-magnetic material, suchas brass. The leg I2 of the square has a sliding fit in a slot 24 of bar23. A pin 25 passes through plates 20 and the sides of bar 23, and alsothrough an elongated slot 26 in the leg I2. Three horseshoe shapedmagnets 30, 3I and 32, mounted together, straddle a non-magnetic bar 33.A non-magnetic U-shaped member 34 is fastened at each end to the bar 33and at its base to a cover plate 35.

A stud 36 extends from bar 23 into a centrally located socket with bar33 so that the magnetic 56 assembly, including the cover 35 and themagnets, may be rotated on the stud. A non-magnetic disc 3l faces thecircular surface formed by members 3l and 22 and the base of bar 23.Located in recesses in the base of the bar 23 are spring pressedplungers 38 which bear against the inwardly disposed surface of the legI2 of the square.

When themagnets are in the position shown in the drawing, the flux linespass to the plates 20 and set up magnetic forces therein. It will benoticed that the outwardly disposed surface 4U of leg I2 projects beyondthe outwardly exposed edges of plates 20, see Fig. 4. When this surface40 is placed against an iron or steel work piece, as shown in Fig. 1,flux passing through plates 20 will cause the tool to hold to the work.The plungers 38 will be depressed until the surface 40 is flush with theouter edges of plate 23. In any case, the surface 40 will be first tocontact the Work and the magnets will draw the plates 20 into contactwith the work to hold the square member firmly thereto.

The cross section of the leg I2 is preferably rectangular, the surface40 being a machined flat surface. The cross section of the testing legI3 is to be rounded, as shown in Fig, 5, so that a gauge contacting thesurface will contact only the highest point. If a square were used, thetwo edges might cause inaccurate reading as the gauge was passed alongthe square, as shown in Fig. 1. Once the tool is applied to the work, itwill hold by its own magnetic forces and the operator is free to movethe gauge I5 to check the condition of the work. When the checking hasbeen done, the gauge can be readily removed by turning the cover plate35 ninety degrees. This will short magnets 30 and 32 through plates 2|and the center magnet will be disposed in alignment with the base of bar23. No magnetic forces will pass between the plates 20 and these plateswill, therefore, lose their magnetism and cause release of the tool.

Suitable stops are provided on the cover plate to limit the off and onmovements.

I claim:

1. In a tool, a holding means comprising parallel plates with highpermeability, insulating means between said plates, said plates havingface edges in a common plane, a plurality of permanent magnets mountedadjacent said plates, movable to a position where flux from said magnetswill enter said plates, and means comprising an L-shaped square havingone leg floatingly mounted between said plates, and resilient meansurging said leg to a position outwardly from said common plane.

2. In a tool, a holding means comprising a pair of angle plates, eachhaving a. side arranged inv parallel relation with the similar side ofthe other, the angled portions of each being positioned in a commonplane, a. bearing disc positioned flush against the outer surfaces ofthe angled portions, a plurality of permanent magnets mounted adjacentsaid plates having pole surfaces arranged to bear on and slide on saiddisc, said magnets being movable from a posiaaaaasa i0 work piece,

STEVEN ROLLER.

